SYMPTOMS
When you visit the Windows Update Web site and scan for new updates, you
receive a message that states that new updates are not available, although
your computer is not up to date.

When you view the contents of the Windows Update.log file, you see an entry
that is similar to the following:

<YYYY-MM-DD> <00:00:00> <00:00:00> Error IUENGINE Querying
software update catalog fromhttps://v4.windowsupdate.microsoft....nifest.asp (Error 0x800C0008)
Note In this example, <YYYY-MM-DD> represents the date of the error, and
<00:00:00> represents a time in 24-hour notation.
RESOLUTION
To resolve this behavior, follow these steps:
1.. Start Internet Explorer.
2.. In the Address box, typehttps://v4.windowsupdate.microsoft....ifest.asp, and then click Go.
3.. In the Revocation information about the certificate was not
available... do you still want to connect? dialog box, click Yes.
4.. On the Tools menu, click Windows Update.
5.. On the Windows Update Web page, click Scan for Updates.
MORE INFORMATION
In Microsoft Windows 2000, Windows Update.log is located in the C:\Winnt
folder, where C: is the hard disk drive where Windows is installed.